This picture compares an uwb- and narrowband-signal: https://cdn.sewio.net/wp-content/uploads/2017/02/UWB-e1486395802254.jpg
Like I understand UWB, the signal("pulse") is directly put into the antenna. Using traditional modulation like AM, the amplitude/frequency pr phase of a sinusoidal signal would be changed according to the data signal. Such a signal then can easily radiate from an antenna (dipole) that is around half the wavelength of the carrier.
How can such an impulse "uwb-pulse" radiate from an uwb-antenna? There is no carrier that is modulated?